In this article

Path Markup Syntax

08/21/2007

읽는 데 7분

In this article

This topic describes the Extensible Application Markup Language (XAML) usage syntax for describing paths. WPF supports a powerful and complex mini-language that you can use to describe geometric paths.

This topic contains the following sections.

Prerequisites

StreamGeometry and PathFigureCollection Mini-Languages

Move Command

Draw Commands

The Close Command

Point Syntax

Special Values

Related Topics

Prerequisites

To understand this topic, you should be familiar with the basic features of Geometry objects. For more information, see the Geometry Overview.

StreamGeometry and PathFigureCollection Mini-Languages

You use the StreamGeometry mini-language when setting a property of type Geometry, such as the Clip property of a UIElement or the Data property of a Path element. The following example uses attribute syntax to create a StreamGeometry.

As you can see from the preceding examples, the two mini-languages are very similar. It's always possible to use a PathGeometry in any situation where you could use a StreamGeometry; so which one should you use? Use a StreamGeometry when you don't need to modify the path after creating it; use a PathGeometry if you do need to modify the path.

For more information about the differences between PathGeometry and StreamGeometry objects, see the Geometry Overview.

A Note about White Space

For brevity, a single space is shown in the syntax sections that follow, but multiple spaces are also acceptable wherever a single space is shown.

Two numbers don’t actually have to be separated by a comma or whitespace, but this can only be done when the resulting string is unambiguous. For instance, 2..3 is actually two numbers: “2.” And “.3”. Similarly, 2-3 is “2” and “-3”. Spaces are not required before or after commands, either.

Syntax

The Extensible Application Markup Language (XAML) attribute usage syntax for a StreamGeometry is composed of an optional FillRule value and one or more figure descriptions.

Move Command

An uppercase M indicates that startPoint is an absolute value; a lowercase m indicates that startPoint is an offset to the previous point, or (0,0) if none exists. If you list multiple points after the move command, a line is drawn to those points though you specified the line command.

You enter each command by using either an uppercase or a lowercase letter: uppercase letters denote absolute values and lowercase letters denote relative values: the control points for that segment are relative to the end point of the preceding example. When sequentially entering more than one command of the same type, you can omit the duplicate command entry; for example, L 100,200 300,400 is equivalent to L 100,200 L 300,400. The following table describes the move and draw commands.

Line Command

Creates a straight line between the current point and the specified end point. l 20 30 and L 20,30 are examples of valid line commands.

Syntax

LendPoint

- or -

lendPoint

Term

Description

endPoint

System.Windows.Point

The end point of the line.

Horizontal Line Command

Creates a horizontal line between the current point and the specified x-coordinate. H 90 is an example of a valid horizontal line command.

Vertical Line Command

Creates a vertical line between the current point and the specified y-coordinate. v 90 is an example of a valid vertical line command.

Syntax

V y

- or -

v y

Term

Description

y

System.Double

The y-coordinate of the end point of the line.

Cubic Bezier Curve Command

Creates a cubic Bezier curve between the current point and the specified end point by using the two specified control points (controlPoint1 and controlPoint2). C 100,200 200,400 300,200 is an example of a valid curve command.

Syntax

C controlPoint1 controlPoint2 endPoint

- or -

c controlPoint1 controlPoint2 endPoint

Term

Description

controlPoint 1

System.Windows.Point

The first control point of the curve, which determines the starting tangent of the curve.

controlPoint 2

System.Windows.Point

The second control point of the curve, which determines the ending tangent of the curve.

endPoint

System.Windows.Point

The point to which the curve is drawn.

Quadratic Bezier Curve Command

Creates a quadratic Bezier curve between the current point and the specified end point by using the specified control point (controlPoint). q 100,200 300,200 is an example of a valid quadratic Bezier curve command.

Syntax

Q controlPoint endPoint

- or -

q contolPoint endPoint

Term

Description

controlPoint

System.Windows.Point

The control point of the curve, which determines the starting and ending tangents of the curve.

endPoint

System.Windows.Point

The point to which the curve is drawn.

Smooth cubic Bezier curve Command

Creates a cubic Bezier curve between the current point and the specified end point. The first control point is assumed to be the reflection of the second control point of the previous command relative to the current point. If there is no previous command or if the previous command was not a cubic Bezier curve command or a smooth cubic Bezier curve command, assume the first control point is coincident with the current point. The second control point, the control point for the end of the curve, is specified by controlPoint2. For example, S 100,200 200,300 is a valid smooth cubic Bezier curve command.

Syntax

S controlPoint2 endPoint

- or -

s controlPoint2 endPoint

Term

Description

controlPoint 2

System.Windows.Point

The control point of the curve, which determines the ending tangent of the curve.

endPoint

System.Windows.Point

The point to which the curve is drawn.

Smooth cubic Bezier curve Command

Creates a quadratic Bezier curve between the current point and the specified end point. The control point is assumed to be the reflection of the control point of the previous command relative to the current point. If there is no previous command or if the previous command was not a quadratic Bezier curve command or a smooth quadratic Bezier curve command, the control point is coincident with the current point.

Syntax

T controlPoint endPoint

- or -

t controlPoint endPoint

Term

Description

controlPoint

System.Windows.Point

The control point of the curve, which determines the starting and tangent of the curve.

endPoint

System.Windows.Point

The point to which the curve is drawn.

Elliptical Arc Command

Creates an elliptical arc between the current point and the specified end point.

Set to 1 if the angle of the arc should be 180 degrees or greater; otherwise, set to 0.

sweepDirectionFlag

Set to 1 if the arc is drawn in a positive-angle direction; otherwise, set to 0.

endPoint

System.Windows.Point

The point to which the arc is drawn.

The Close Command

Ends the current figure and creates a line that connects the current point to the starting point of the figure. This command creates a line-join (corner) between the last segment and the first segment of the figure.

Syntax

Z

- or -

z

Point Syntax

Describes the x- and y-coordinates of a point.

Syntax

x , y

- or -

x y

Term

Description

x

System.Double

The x-coordinate of the point.

y

System.Double

The y-coordinate of the point.

Special Values

Instead of a standard numerical value, you can also use the following special values. These values are case-sensitive.